Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Free particle

In physics, a free particle is a particle that, in some sense, is not bound by an external force,
or equivalently not in a region where its potential energy varies. In
classical physics, this means the particle is present in a "field-free"
space. in quantum mechanics, it means a region of constant potential,
usually set to zero in the region of interest since potential can be
arbitrarily set to zero at any point (or surface in three dimensions) in
space.